Heat Pump Defrost Question

https://felixutvt287.unionquill.com/posts/comfort-experts-pollen-season-maintenance-tips-to-avoid-ac-repair-in-north-fort-worth

Heat Pump Defrost Question Is it normal for a heat pump to blow steam from the outdoor unit in winter? Ours did that during the freeze last February and I panicked a bit. Sounds like it might just be the defrost cycle from what I'm reading here